Three-phase Four-wire Autonomous Wind Energy Conversion System Using Permanent Magnet Synchronous Generator

This article deals with an autonomous wind energy conversion system employing a permanent magnet synchronous generator feeding three-phase four-wire local loads in stand-alone mode without using a mechanical position sensor. The proposed autonomous wind energy conversion system utilizes two back-to-back connected pulse width modulated insulated gate bipolar transistors based voltage source converters with a battery energy storage system at their DC link. The main objectives of the control algorithm for voltage source converters are to achieve a maximum power tracking through the rotor speed control of a permanent magnet synchronous generator under varying wind speeds and control of the magnitude and frequency of the load voltage. The proposed system is capable of bidirectional active and reactive power flows, by which it controls the magnitude and the frequency of the load voltage. The proposed electro-mechanical system, consisting of a permanent magnet synchronous generator, a maximum power tracking controller, and a voltage and frequency controller, is designed, modeled, and simulated in MATLAB using Simulink and Sim-Power System toolboxes. Also, different aspects of the proposed autonomous wind energy conversion system are studied for various types of linear and non-linear loads under varying wind speed conditions. The performance of the proposed autonomous wind energy conversion system is presented to demonstrate its capability for maximum power tracking, voltage and frequency control, harmonic elimination, and load balancing for the isolated power generation.